Rebound-check shock absorber



Dec. 11 1923.

E. A TJERDAHL REBOUND CHECK SHOCK ABSORBER Filed Oct. 23.. 1918 zaZoz;

. showing. the inventonr'app ofthe motor vehicle es is necessary tounder- I stand the constructiqn and operation of the Patented De'cld!1923.

.r'ArE-iir foFrics;

vanyvnnn Arman rvnnnarm or cnrcaeo, nlmnors, nssrenon or ONE-HALF ToJOSEPH F. navrs, or-omo'aeo; rumors.

announn-cr'mex snocx ansoimnn.

Application filed October 23,1918 .Serial No. 259,418.

' To all whom it may concern Be it known that I, EDWARD ARNAR Tvnn-DAHL, a citizen ofthe' United States, resid' ing at Chicago, in'thccounty of Cook and State of Illinois, have inventedcertain new anduseful Improvements in Rebound-Check Shock Absorbers, .of which thefollowing is a specification. This invention relates to that class ofshockabsorbers which" are used principally on motor vehicles for thepurpose of checkin the rebound actionof the springs. y he object of theinvention is'primarily :toprovide a device-"of this character which-will'eifectually 'checkthe rebound of the springs and which can bereadily and easily applied to most well kri'own makes of motor 7vehicles, and possibly to-all of them, with such changes and adaptationsas may be necessary to adapt the invention thereto;

' In the accompanying drawingi have il- 'l'ustrated a simple embodimentand adapta-v tionof the invention inswhich. Fig.1 is a side elevation,partly in section,

inventi'om' a Fig. 2 is atop planrview and so 0 fF1g. 1'. j :a Referringto the drawings, 4 is the 'frame, 5 the 'sprin and 6 the rear axlehousin of an automo ile. I 5 secured rigidly to the frame 4 by'bolts 8and. spaced from'the frame by suitable- Two spacer sleeves 9 on saidbolts. I0 andll are rigidly mounted on the plate in tandem relationsubstantially as shown in;-

f Fig. 1. I have ioundfin practice that it is a satisfactoryarrangement; to have these. drums mounted in substantially the samehorizontal plane as "shown in Fig. '1': but I nsect; regard this asian'- essential arrange,

. mentl and reserve the right to vary therefrom y 'as may be'foundsatisfactory and desirable.

' .12 is arran d; -i almost' entirely 'around'the drum 10 an eitends upbetween the-drums andover the dr'umll. The upper A strap E e 11d of thisst-rap is vconnected by'a suitable Yclam'pdevice 13 to the end of one ormore coil springs 14 which are connected at. the otherendto a stud 15 onthe bracket plate 7, this stud being preferably located at the .theyoke, but this arrangement may alsobgi red to as much Fig. 3 is asectional view on the line 3 3 A plate or'bracket ."is-

forward end of the bracket plate: in front and above the laneof thedrums. The lower depending en .of the strap is fastened'by a suitableclamp device to a yoke 16- which cient size for universal use on allforms of housings and in any suitable'position on the housings'so that'said y'oke maybe made standardfor general use. When the yoke isproperly adjusted with relation tothe drums the bolt 18 can be tightenedto lock;

the yoke rigidlyin set position on the housing. "Ihave found itdesirable to arrange '70 the drums with relation to the-rear-"axlehousing in the mannerillustrated in Fig. 1, the forward drum llbemgalways directly abovethe housing to provide for a direct pull l l[)0n the strap between-said drums andff varied within reasonablelimitations'f-toaf adapt the invention to different construe 'tions ofmotor vehicle assemblies.

In practice th parts are'arranged-asillus-f bated with. the springsnormally at tension 'so'that the ,strap is taut and whenever-'thej frameand axle are brou ht into closer relation the springs will aumaticallytake up any slaick that might otherwise come in they strap.-This spring control friction "strap traveling over the rigid drums 10and 11 will I .pievent thenormal tendency of the vehicle spring torebound to normal position, which? vehicle 'sprin sf- Thus it willbelobserved results in. bouncing the body of the car-.andJ--- often-inbreaking one or more leavesoithe that as the vehicle spring, whenflexed, tends to resume its normal position the friction. strap willybe;pulledby'the axleover the;

drums'against the'tensioni'of sprin H 1 1 and with siiiiicient frictionto prevent t e rebound action referred to and toinsure the return'oftheffraine and rear-axle to their normal relative positions a steady,even is. movement which will avo d-bouncing the body and thefo'ccupantof the car and pre ventbreakagegof the spring leaves. a

and' can be manufactured' at low cost. The

drums may be made bystampfiig'and they junction with the bracket plate7, guides to -retain the friction strap in place on the drums andpreventaccidental displacement f the strap. T

My invention can be readily adapted and applied to the great majority,if not all, of the commercial makes of'inotor vehicles and to avery-large extent, and possibly for all 4 purposes, it can be made instander-d form 'for general use. The invention applied to where space isalways, so far as I. am aware,

that part of the motor vehicle assembly eft' for action of the springsand this not nlyflfacilitates the applicationof the inentionto a vehiclebut also enables its uni ersal -use without necessitating any changes.-.'in -t-l1 e assembly. I '1 I am aware that changes in the form and"proportion of the parts and in the details of "construction may benecessary to adapt the {inventionto difierent makes of motor ve--hicles, and ,I reserve the'right to make all" such changes as fairlyfall within the scope ofthe appended claims although it is my betliefthat the invention may be made in a standard :formfor universalapplication to '3 -'a Tgreatmajority, if not all, offth'e wellknown-commercial makes of motor vehicles;

.1. A shock" absorber comprising-an at- 'taching bracket, a pair ofnon-rotatable -}1orizontally 'aligned drums carriedv by the-fr0nt=jof1ahe bracket, each drum being hollow and,. open. at its outerend, fastening drums and provided with means for connec- .tion withthetaxle of a vehicle, and a substantially horizontal helical springhaving one end secured to the other end of the frictionstrap and itsopposite end secured to Y the bracket, the drums, strap and spring allbeing in the same vertical plane.

2-. A shock absorber comprising an attaching bracket, :1 pair ofsubstantially horizontal non-rotatable drums carried by the bracket, afriction strap engaging the drums,

a spring carried by the bracket and secured to one end of the frictionstrap, the other endof the friction strap depending from one of the.drums, and means for connecting said depending end of the strap with theaxle of a vehicle, said means including a yoke upon the depending end ofthe strap, a cross bar ri'ed'by t e cross bar, the drums, the strap,

the spring,.the' yoke and the cross bar all being'inthe same verticallane.

EDWARD ARNAR T ERDAHL. Witnesses: o a

Y J. W. Davrs,

' carried b the yoke, and a clamp screw car-

